Machine tool



2 Sheets-Sheet 1 @MMM www ww Jan. 31, 1928.

K. F. GALLIMORE MACHINE TOOL Filed Feb.1o, 192s NAW) H 1y Q y Frm y wh,

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Jan. 3l, 1928.

1,657,824 K. F. GALLIMORE MACHINE TOOL Filed Feb.10, 1923 2 Sheets-Sheet 2 Patented `ian. 531i, 1928.

KEITH F. GALLIMORE, F FOND DU LAC,

lISCONSIN, ASSIGNOR, MESHE ASSIGN- MENTS, 'ro *ran HnALD MACHINE contraria', or woncnsrnie, Mnssacacsaars, a

CORPGRATION 0F MASSACHUSETTS.

MACHINE TOOL.

Application filed February l0, 1923. Serial No. 618,233.

This invention relates to machine tools and is herein shown as applied to a grinding machine of the type which is fully disclosed in a patent to Prentice Conradson et al., No.

1,534,302, granted April. 21, 1925. The invention relates more dparticularly to 1inprovements in the grin ing spindle carriage and the casing supported thereby, for `housing the driving motor.

In the machine shown in the patent herein referred to, the driving motor is mounted on the underside of the carriage beneath the spindle to travel with the carriage, and is enclosed by the machine base and the carriage housing. The motor windings and commutator are completely enclosed within a motor casing to protect them from the.

mist, falling coolant and abrasive particles present within the base. The casing and the machine walls, however, interfere with a proper ventilation and cooling of the motor windings, thereby endangering the overheating of .the motor.

The primary object of my invention is to provide* means for properly Ventilating and cooling the motor without in any way dispensing with the advantageous features afforded by mounting and enclosing the motor in the manner disclosed above.

3o I accomplish this object by providing suitable passages through the carriage and motor casing with air propelling means, whereby air, which is comparatively dry and clean, is drawn through the motor windings and then expelled at the rear end of the motor casing.;

Further objects and, advantages will become apparent as the description proceeds.

In the accompanying drawings, Figure 1 is a vertical sectiona View, taken in the plane of line 1-1 of Fig. 2, vof a Grinding machine embodying the features o? my invention.

Fig. 2 is a' transverse vertical section taken in the plane of line 2 2 of Fig. 1.

Fig. 3 is a fragmentary plan view of the carriage with the spindle and its housing removed.

While my invention is susceptible of various modifications I have shown in the drawings and will' herein describe in detail, the preferred embodiment, but it should be understoodthat I do not thereby intend to vfront end of the carriage limit the invention to the eaact construction d1sclosed,-but aim ,in the suhjoiiied claims 55 to cover all modifications and alternative constructions falling within the scope of the invention. Y.

,Referring to the drawings, the base of the grinding machine is herein represented as @0 comprising two side walls 10 and two end walls 11. On the upper edges of the side walls are formed grooves or ways 12 `to receive the ii-shaped ribs or guides 13 formed on the opposite sides 14 of the carriage bod 15. 16 designates guard plates 16 which7 overlie and protect the 'ways 12.

Mounted in the upper part of the carriage 15 is a rotary spindle 1?' having a grinding wheel 18 on its free end. 0n its o posite 79 end the spindle 17 supports a pulley 19 adapted to be driven by a belt 20 which runs over a pulley 21 on the armature shaft 22 of a motor 23.

A .suitable belt tensioner for the belt 20 is 75 provided comprising in the present instance, an arm 24, pivoted at 25 and carrying a pulley 26 on its free end which is pressed toward the belt by means of a compression spring 27.

The motor 23 is mounted on the underside of the carriage 15 by bolting the motor easing 28 to lateral lfianges 29 which in turn are secured to two laterally spaced depending portions 3() on the carriage. A splash plate 31 is fixed to and depends from the to yprevent coolant the driving motor from being splashed upon 23.- The motor is thus mounted to move with the carriage, and occupies the space between the walls of the base.

Any suitable means may be employed for reciprocating the carriage 15 upon its ways 12. In the present instance, I employ hydraulic means `comprising a cylinder 32 positioned between the depending portions 30 of the carriage and rigidly secured thereto by the lateral flanges 29. A piston 33 in the ,cylinder 32 is stationarily mounted bctween the end walls 11 of the machne'base 100 `by means of hollow rods 34 which project axially from the ends of the piston through the ends of the cylinder. Any suitable actuating fluid such as oil is admitted into the cylinder at opposite sides of the piston. through the hollow rods 34. A stationary housing 35 mounted on the machine base almost completely encloses the cylinder 32 and rods 34. A l Y The means for'controllin the admission of actuating uid to the cylinder 32 is fully disclosed in the copending applicatlon previously referred to, and since itforms no part of the present inventionl will not be erein described.'A

Means is provided for Ventilating the motor 23 without exposing the latter to the vapors and suspended emery particles pres ent within the base during the grinding operation. The upper part of the carriage 15 is provided with a chamber 36 opening through one of'it's side walls at 37. A screenl 38 is positioned across the opening to keep out any large suspended particles which may be resent in the air.

omunicating with the chamber 36 at each side are two downwardly and Yforwardly inclined assages 39 which extend through the depen ing portions 30 and open at their lower ends into a vtransverse passage 40 formed in the flanges 29. rllhe passage 4l) in turn communicates at its center througl an opening 41 with the front interior ofthe casing 28. Apertures 42 are provided in the rear wall of the casing 23 to furnish an outlet for the heated gases surrounding the motor windings. Mounted on' the rear end of the motor armature to rotate therewith is a fan 43 of the end thrust type which is adapted to draw awa the heated gases around the motor win 'ngs, and expel them from. the casing 28 through the apertures 42. Freshair will continuously How into the casing l() through the chamber 36 and -passages 39 and 40to replace the heated air drawn out by the fan,

thereby keeping the motor well ventilated and cooledat all times.

I claim as my invention: v

l. A machine tool having, in combination, a hollow base,l a carriage mounted on the upper side of said base, a motor having an enclosing casing rigidly secured to the underside of said carriage within said base, said carriage having an air passage leading from a point above said base` and communicating with one endl of the motor-casing, the opposite end of said casing having Yan exit opening for the air, and a fan fixed on the armature shaft and arranged to cause air to iow throu h said motor win ings. Y

2..A machine of the character described having, 'in combination, a hollow case, Va carriage mounted to slide on the upper part of said base, means mounted ycentrally in 'the lower portion oi said carriage for reciprocating the carriage, a motor having an enclosing casing mounted on the underside of said carriage beneath said reciprocating means, said carriage having a chamber and passage and through the an air passage opening into said chamber at a point above said base, and' the. carriage having air passages extending from said chamber 'onoplposite sides of said` reciprocating means an commumcatingatone end4 wlth -one end of the Inotorcasing, the opposite end of saidcasing having an exit -foimthe air, and means for causing air to dow through saidchambenpassages and motor casing. r

3. A machine tool having, in combination, a hollow base, a carriage mounted for movement on said base,I said carriage having a pair of spaced depending brackets on its under side, means positioned between said brackets for moving said carriage, a motor' having a closed casing mounted on the under 'side on said brackets below said power means, an air passage leadino' from above the machine tool through said5 carriage and said depending brackets into said motor casing, and means for causing a iow of air throu h said passage andmotor.

4. machine tool having, in combination, a base, a carriage slidable on said base and having a spindle, a motor mounted to move with said carriage and operatively connected windings, and means for causing a currentr of air to How through said passage.

6. A machine tool having, in combination, a closed base having a pair of guideways on its upper edges, an elongated carriage reciprocable on said guideways, a spindle rotatably mounted in said carriage, a motor having a closed casing mounted within said v base on the under side of .said carriage, a splash plate secured to said carriage directly ahead of said motor, and means for directing and inducing 'a flow of air from without the machine base directly through said motor casing to obtain clear, dry ventilation.

7. A machine tool having, in combination, a closed base, a carriage reciprocable on said base, a motor having a closed casing in the under side ofsaid base, and means for inducing and directing a confined current of air to said casing from without said base.

8. A machine tool having, in combination, a hollow base, a carriage mounted for move-y ment on said base, said' carriage having .a pair of spaced depending brackets on its underside, means for moving said carriage positioned! between und spanning seid oraeksaid -'rst mentioned means; and the upper ers, e motion having a closed casing mounted side of said-motor casing, and serving to on the underside of and spanning said Connect the lower ends of the air passage n l" brackets, an air passage leading from the said brackets to said motor casing.

"'r outside of the machine tool through said In testimony whereof7 l have hereunto carriage and then through said depending afxed my signature. brackets, and :u1 air passage formed between KEITH F. GALMGRE. 

